rfc1037.txt

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Greenberg & Keene                                              [Page 22]

RFC 1037             NFILE - A File Access Protocol        December 1987


   The connection-identifier informs the user of the correct identity of
   the logical port that the server has provided.  NFILE expects the
   connection-identifier to be a string.  For TCP this string is the
   port number represented in decimal.  For Chaosnet, this string is the
   contact name.  The connection-identifier is used only once; in all
   subsequent NFILE commands that need to reference either of the data
   channels that constitute this data connection, the new-input-handle
   and new-output-handle are used.

   For background information:  See the section "NFILE Control and Data
   Connections", section 4.

8.9  DELETE Command

   Command:  (DELETE tid handle pathname)

   Response: (DELETE tid)

   DELETE deletes a file on the remote file system.

   Either a handle or a pathname must be supplied, but not both.  If
   given, the handle must be a data channel handle for a data stream
   opening, or a direct file identifier for a direct access opening.
   pathname is a string in the full pathname syntax of the server host.
   See the section "Syntax of File and Directory Pathname Arguments",
   section 7.4.

   With a pathname supplied, the DELETE command causes the specified
   file to be deleted.  DELETE has different results depending on the
   operating system involved.  That is, DELETE causes soft deletion on
   TOPS-20 and LMFS, and hard deletion on UNIX and Multics.  If an
   attempt is made to delete a delete-through link on a Symbolics LMFS,
   its target is deleted instead.

   If the handle argument is supplied to DELETE, the server deletes the
   open file bound to the data channel specified by handle at close
   time.  This is true in both the output and input cases.

8.10  DIRECT-OUTPUT Command

   Command:  (DIRECT-OUTPUT tid direct-handle output-handle)

   Response: (DIRECT-OUTPUT tid)

   DIRECT-OUTPUT starts and stops output data flow for a direct access
   file opening.  DIRECT-OUTPUT explicitly controls binding and
   unbinding of an output data channel to a direct access opening.




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RFC 1037             NFILE - A File Access Protocol        December 1987


   direct-handle is a required argument, and output-handle is optional.

   If supplied, output-handle is a request to bind an output data
   channel (indicated by output-handle) to the direct access opening
   designated by the direct-handle.  The specified output data channel
   must be free.  The server binds the data channel and begins accepting
   data from that connection and writing it to the opening.

   If the output-handle is omitted, this is a request to unbind the
   channel and terminate the active output transfer.

8.11  DIRECTORY Command

   Command:  (DIRECTORY tid input-handle pathname control-keywords
              properties)

   Response: (DIRECTORY tid)

   DIRECTORY returns a directory listing including the identities and
   attributes for logically related groups of files, directories, and
   links.  If the command is successful, a single token list containing
   the requested information is sent over the data channel specified by
   input-handle, and the data channel is then implicitly freed by both
   sides <2>.  For details on the format of the token list:  See the
   section "NFILE DIRECTORY Data Format", section 8.11.1.

   pathname specifies the files that are to be described; it is a string
   in the full pathname syntax of the server host.  See the section
   "Syntax of File and Directory Pathname Arguments", section 7.4.

   The pathname generally contains wildcard characters, in operating-
   system-specific format, describing potential file name matches.  Most
   operating systems provide a facility that accepts such a pathname and
   returns information about all files matching this pathname.  Some
   operating systems allow wildcard (potential multiple) matches in the
   directory or device portions of the pathname; other operating systems
   do not.  There is no clear contract at this time about what is
   expected of servers on systems that do not allow wildcard matches (or
   some kinds of wild card matches), when presented with a wildcard.

   properties is a token list of keywords that are the names of
   properties.  If properties is omitted or supplied as the empty token
   list, the server sends along all properties.  If any properties are
   supplied, the user is requesting the server to send only those
   properties.






Greenberg & Keene                                              [Page 24]

RFC 1037             NFILE - A File Access Protocol        December 1987


   control-keywords ARGUMENT TO DIRECTORY

   control-keywords is a token list of keywords.  The control-keywords
   affect the way the DIRECTORY command works on the server machine.
   Although some of the options below request the server to limit (by
   some filter) the data to be returned, it is never an error if the
   server returns more information than is requested.

   The following keywords are recognized:

   DELETED

   Includes soft-deleted files in the directory list.  Without this
   option, they must not be included. Such files have the DELETED
   property indicated as true" among their properties.  DELETED is
   ignored on systems that do not support soft deletion.

   DIRECTORIES-ONLY

   This option changes the semantics of DIRECTORY fairly drastically.
   Normally, the server returns information about all files,
   directories, and links whose pathnames match the supplied pathname.
   This means that for each file, directory, or link to be listed, its
   directory name must match the potentially wildcarded) directory name
   in the supplied pathname, its file name must match the file name in
   the supplied pathname, and so on.

   When DIRECTORIES-ONLY is supplied, the server is to list only
   directories, not whose pathnames match the supplied pathname, but
   whose pathnames expressed as directory pathnames match the
   (potentially wildcarded) directory portion of the supplied pathname.
   The description of the PROBE-DIRECTORY keyword that can be supplied
   as the direction argument of the OPEN command discusses this:  See
   the section "OPEN Command", section 8.20.

   It is not yet established what servers on hosts that do not support
   this type of action natively are to do when presented with
   DIRECTORIES-ONLY and a pathname with a wildcard directory component.

   FAST Speeds up the operation and data transmission by not listing any
   properties at all for the files concerned; that is, only the
   truenames are returned.









Greenberg & Keene                                              [Page 25]

RFC 1037             NFILE - A File Access Protocol        December 1987


   NO-EXTRA-INFO

   Specifies that the server is to suppress listing those properties
   that are generally more difficult or expensive to obtain.  This
   typically eliminates listing of directory-specific properties such as
   information about default generation counts and expunge dates.

   SORTED

   This causes the directory listing to be sorted.  The sorting is done
   alphabetically by directory, then by file name, then file type, then
   file version (by increasing version number).

8.11.1  NFILE DIRECTORY Data Format

   If the NFILE DIRECTORY command completes successfully, a single token
   list containing the requested directory information is sent on the
   data channel specified by the input-handle argument in the DIRECTORY
   command.  This section describes the format of that single token
   list, and gives further detail on the properties argument to
   DIRECTORY.

   The token list is a top-level token list, so it is delimited by TOP-
   LEVEL-LIST-BEGIN and TOP-LEVEL-LIST-END.  The top-level token list
   contains embedded token lists.  The first embedded token list
   contains the empty token list followed by property/value pairs
   describing property information of the file system as a whole rather
   than of a specific file.  NFILE requires one property of the file
   system to be present: DISK-SPACE-DESCRIPTION is a string describing
   the amount of free file space available on the system.  The following
   embedded token lists contain the pathname of a file, followed by
   property/value pairs describing the properties of that file.

   The following example shows the format of the top-level token list
   returned by DIRECTORY, for two files.  It is expected that the server
   return several property/value pairs for each file; the number of
   pairs returned is not constrained.  In this example, two
   property/value pairs are returned for the file system, two pairs are
   returned for the first file, and only one pair is returned for the
   second file.

             TOP-LEVEL-LIST-BEGIN
             LIST-BEGIN       - first embedded token list starts
             LIST-BEGIN       - an empty embedded token list starts
             LIST-END         - the empty embedded token list ends
             prop1 value1     - property/value pairs of file system
             prop2 value2
             LIST-END



Greenberg & Keene                                              [Page 26]

RFC 1037             NFILE - A File Access Protocol        December 1987


             LIST-BEGIN
             pathname1        - pathname of the first file
             prop1 value1     - property/value pairs of first file
             prop2 value2
             LIST-END
             LIST-BEGIN
             pathname2        - pathname of the second file
             prop1 value1     - property/value pairs of second file
             LIST-END
             TOP-LEVEL-LIST-END

   The following example is designed to illustrate the structure of the
   top-level token list by depicting TOP-LEVEL-LIST-BEGIN and TOP-
   LEVEL-LIST-END by parentheses and LIST-BEGIN and LIST-END by squarbe
   rackets.  respectively. The indentation, blank spaces, and newlines
   in the example are not part of the token list, but are used here to
   make the structure of the token list clear.

                   ([   [ ]    prop1 value1 prop2 value2]
                    [pathname1 prop1 value1 prop2 value2]
                    [pathname2 prop1 value1])

   The pathname is a string in the full pathname syntax of the server
   host.  See the section "Syntax of File and Directory Pathname
   Arguments", section 7.4.

   For further information on file property/value pairs:  See the
   section "Format of NFILE File Property/Value Pairs", section 7.5.

8.12  DISABLE-CAPABILITIES Command

   Command:  (DISABLE-CAPABILITIES tid capability)

   Response: (DISABLE-CAPABILITIES tid cap-1 success-1
                  cap-2 success-2 cap-3 success-3 ...)

   DISABLE-CAPABILITIES causes an access capability to be disabled on
   the server machine.  capability is a string naming the capability to
   be disabled.  The meaning of the capability is dependent on the
   operating system.

   The return values cap-1, cap-2, and so on, are strings specifying
   names of capabilities.  If the capability named by cap-1 was
   successfully disabled, the corresponding success-1 is supplied as
   Boolean truth; otherwise it is the empty token list.






Greenberg & Keene                                              [Page 27]

RFC 1037             NFILE - A File Access Protocol        December 1987


   Although the user can specify only one capability to disable, it is
   conceivable that the result of disabling that particular capability
   is the disabling of other, related capabilities.  That is why the
   command response can contain information on more than one capability.

8.13  ENABLE-CAPABILITIES Command

   Command:  (ENABLE-CAPABILITIES tid capability password)}

   Response: (ENABLE-CAPABILITIES tid cap-1 success-1
              cap-2 success-2 cap-3 success-3 ...)

   ENABLE-CAPABILITIES causes an access capability to be enabled on the
   server machine.  The password argument is optional, and should be
   included only if it is needed to enable this particular capability.
   Both password and capability are strings.  The meaning of the